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1 SN74AS20N DUAL 4-INPUT POSITIVE-NAND GATES 97K TI 4188549
2 SN74AS20N DUAL 4-INPUT POSITIVE-NAND GATES 125K TI 2139899
3 SN74AS20N DUAL 4-INPUT POSITIVE-NAND GATES 125K TI 266909
4 SN74AS20NSR DUAL 4-INPUT POSITIVE-NAND GATES 125K TI 2664178
5 SN74AS20NSR DUAL 4-INPUT POSITIVE-NAND GATES 125K TI 266910